Oralia agrees to babysit Avery's daughter "when I can" if Avery promises to clean Oralia's house every week.This agreement is ________ because it is based on a(n) ________.

A) enforceable;option contract
B) enforceable;future gift
C) unenforceable;promissory estoppel
D) unenforceable;illusory promise

Illusory Promise

A statement that appears to commit to an action but does not actually bind the party to any obligation.

Promissory Estoppel

A legal principle that prohibits a party from going back on a promise made to another party, if the latter has reasonably relied on that promise to their detriment.

Option Contract

A contract granting one party the option to execute a transaction, such as buying or selling an asset at a future date.